<?php
/* For licensing terms, see /license.txt*/

/**
 * create a new category definition for the user information.
 *
 * @author - Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesch� <gesche@ipm.ucl.ac.be>
 *
 * @param string $title   - category title
 * @param string $comment - title comment
 * @param int    $nbline  - lines number for the field the user will fill
 *
 * @return bool true if succeed, else bolean false
 */
function create_cat_def($title = "", $comment = "", $nbline = "5")
{
    global $TBL_USERINFO_DEF; //taken from userInfo.php

    $title = Database::escape_string(trim($title));
    $comment = Database::escape_string(trim($comment));
    $nbline = strval(intval($nbline));

    if (0 == (int) $nbline || empty($title)) {
        return false;
    }

    $sql = "SELECT MAX(rank) as maxRank FROM ".$TBL_USERINFO_DEF;
    $result = Database::query($sql);
    if ($result) {
        $maxRank = Database::fetch_array($result);
    }

    $maxRank = $maxRank['maxRank'];
    $thisRank = $maxRank + 1;

    $sql = "INSERT INTO $TBL_USERINFO_DEF SET
            title       = '$title',
            comment     = '$comment',
            line_count  = '$nbline',
            rank        = '$thisRank'";

    Database::query($sql);

    return true;
}

/**
 * modify the definition of a user information category.
 *
 * @author - Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesch� <gesche@ipm.ucl.ac.be>
 *
 * @param int    $id      - id of the category
 * @param string $title   - category title
 * @param string $comment - title comment
 * @param int    $nbline  - lines number for the field the user will fill
 *
 * @return - boolean true if succeed, else otherwise
 */
function edit_cat_def($id, $title, $comment, $nbline)
{
    global $TBL_USERINFO_DEF;

    if (0 == $nbline || 0 == $id) {
        return false;
    }
    $id = strval(intval($id)); //make sure id is integer
    $title = Database::escape_string(trim($title));
    $comment = Database::escape_string(trim($comment));
    $nbline = strval(intval($nbline));

    $sql = "UPDATE $TBL_USERINFO_DEF SET
            title       = '$title',
            comment     = '$comment',
            line_count  = '$nbline'
            WHERE id    = '$id'";
    Database::query($sql);

    return true;
}

/**
 * remove a category from the category list.
 *
 * @author - Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesche <gesche@ipm.ucl.ac.be>
 *
 * @param int  $id     - id of the category
 *                     or "ALL" for all category
 * @param bool $force  - FALSE (default) : prevents removal if users have
 *                     already fill this category
 *                     TRUE : bypass user content existence check
 * @param int  $nbline - lines number for the field the user will fill
 *
 * @return bool - TRUE if succeed, ELSE otherwise
 */
function remove_cat_def($id, $force = false)
{
    $TBL_USERINFO_DEF = Database:: get_course_table(TABLE_USER_INFO_DEF);
    $TBL_USERINFO_CONTENT = Database:: get_course_table(TABLE_USER_INFO_CONTENT);

    $id = strval(intval($id));

    if ((0 == (int) $id || $id == "ALL") || !is_bool($force)) {
        return false;
    }
    $sqlCondition = " WHERE id = $id";
    if (!$force) {
        $sql = "SELECT * FROM $TBL_USERINFO_CONTENT $sqlCondition";
        $result = Database::query($sql);

        if (Database::num_rows($result) > 0) {
            return false;
        }
    }
    $sql = "DELETE FROM $TBL_USERINFO_DEF $sqlCondition";
    Database::query($sql);
}

/**
 * move a category in the category list.
 *
 * @author - Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesch� <gesche@ipm.ucl.ac.be>
 *
 * @param int    $id        - id of the category
 * @param string $direction "up" or "down" :
 *                          "up"    decrease the rank of gived $id by switching rank with the just lower
 *                          "down"  increase the rank of gived $id by switching rank with the just upper
 *
 * @return bool true if succeed, else boolean false
 */
function move_cat_rank($id, $direction) // up & down.
{
    $TBL_USERINFO_DEF = Database:: get_course_table(userinfo_def);
    $id = strval(intval($id));

    if (0 == (int) $id || !($direction == "up" || $direction == "down")) {
        return false;
    }

    $sql = "SELECT rank FROM $TBL_USERINFO_DEF WHERE id = $id";
    $result = Database::query($sql);

    if (Database::num_rows($result) < 1) {
        return false;
    }

    $cat = Database::fetch_array($result);
    $rank = (int) $cat['rank'];

    return move_cat_rank_by_rank($rank, $direction);
}

/**
 * move a category in the category list.
 *
 * @author - Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesche <gesche@ipm.ucl.ac.be>
 *
 * @param int    $rank      - actual rank of the category
 * @param string $direction "up" or "down" :
 *                          "up"    decrease the rank of gived $rank by switching rank with the just lower
 *                          "down"  increase the rank of gived $rank by switching rank with the just upper
 *
 * @return bool true if succeed, else boolean false
 */
function move_cat_rank_by_rank($rank, $direction) // up & down.
{
    $TBL_USERINFO_DEF = Database:: get_course_table(userinfo_def);

    if (0 == (int) $rank || !($direction == "up" || $direction == "down")) {
        return false;
    }

    if ($direction == "down") {
        // thus increase rank ...
        $sort = "ASC";
        $compOp = ">=";
    } else {
        // thus decrease rank ...
        $sort = "DESC";
        $compOp = "<=";
    }

    // this request find the 2 line to be switched (on rank value)
    $sql = "SELECT id, rank FROM $TBL_USERINFO_DEF 
            WHERE rank $compOp $rank
            ORDER BY rank $sort LIMIT 2";

    $result = Database::query($sql);

    if (Database::num_rows($result) < 2) {
        return false;
    }

    $thisCat = Database::fetch_array($result);
    $nextCat = Database::fetch_array($result);

    $sql1 = "UPDATE $TBL_USERINFO_DEF SET rank ='".$nextCat['rank'].
        "' WHERE id = '".$thisCat['id']."'";
    $sql2 = "UPDATE $TBL_USERINFO_DEF SET rank ='".$thisCat['rank'].
        "' WHERE id = '".$nextCat['id']."'";

    Database::query($sql1);
    Database::query($sql2);

    return true;
}

/**
 * @author Hugues Peeters - peeters@ipm.ucl.ac.be
 *
 * @param int    $user_id
 * @param string $course_code
 * @param array  $properties  - should contain 'role', 'status', 'tutor_id'
 *
 * @return bool true if succeed false otherwise
 */
function update_user_course_properties($user_id, $course_code, $properties, $horaire_name, $course_id)
{
    global $tbl_coursUser, $_user;
    $sqlChangeStatus = "";
    $user_id = (int) $user_id; //filter integer
    $course_code = Database::escape_string($course_code);
    $course_id = (int) $course_id;
    $horaire_name = Database::escape_string($horaire_name);
    $status = Database::escape_string($properties['status']);
    $tutor = Database::escape_string($properties['tutor']);
    if ($user_id != $_user['user_id']) {
        $sqlChangeStatus = "status = '$status',";
    }

    $sql = "UPDATE $tbl_coursUser
            SET $sqlChangeStatus 
                is_tutor = '$tutor'
            WHERE user_id = $user_id AND c_id = $course_id";
    Database::query($sql);
    //update official-code: Horaire
    $table_user = Database::get_main_table(TABLE_MAIN_USER);
    $sql2 = "UPDATE $table_user
             SET official_code = '$horaire_name'
             WHERE user_id = $user_id";
    Database::query($sql2);
    //on récupère l'horaire
    $tbl_personal_agenda = Database:: get_main_table(TABLE_PERSONAL_AGENDA);
    $TABLECALDATES = Database:: get_course_table(cal_dates);
    $jour = 0;
    $sql3 = "SELECT date FROM $TABLECALDATES 
             WHERE 
                horaire_name = '$horaire_name' AND 
                status = 'C' AND    
                c_id = $course_id 
             ORDER BY date ";
    $result3 = Database::query($sql3);

    if (Database::num_rows($result3) == '0') {
        return false;
    }

    //on efface ce qui est déjà inscrit
    $sql4 = "DELETE FROM $tbl_personal_agenda
         WHERE user = $user_id 
         AND text = 'Pour le calendrier, ne pas effacer'";
    Database::query($sql4);

    $sql = "DELETE FROM $tbl_personal_agenda
         WHERE user = $user_id AND title = 'Examen*'";
    Database::query($sql);
    //à chaque date dans l'horaire
    while ($res3 = Database::fetch_array($result3)) {
        $date = $res3['date'];
        //on incrémente les jours de cours
        $date = api_get_utc_datetime($date);
        $jour = $jour + 1;
        //on réinsère le nouvel horaire
        $sql = "INSERT ".$tbl_personal_agenda." (user,title,text,date) 
                VALUES ($user_id, $jour, 'Pour le calendrier, ne pas effacer', '$date')";
        Database::query($sql);
        // pour les inscrire examens dans agenda
        $sql5 = "SELECT date FROM $TABLECALDATES 
                  WHERE horaire_name = '$horaire_name' AND status = 'E'
                  AND    c_id = '$course_id' 
                  ORDER BY date 
                  ";
        $result5 = Database::query($sql5);
    }

    //à chaque date dans l'horaire
    while ($res5 = Database::fetch_array($result5)) {
        $date = $res5['date'];
        $date = api_get_utc_datetime($date);
        //on réinsère le nouvel horaire
        $sql7 = "INSERT $tbl_personal_agenda (user, title, date) VALUES  ($user_id, 'Examen*', '$date')";
        Database::query($sql7);
    }
}

/**
 * fill a bloc for information category.
 *
 * @author - Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesche <gesche@ipm.ucl.ac.be>
 *
 * @param $definition_id
 * @param $user_id
 * @param $user_ip
 * @param $content
 *
 * @return bool true if succeed, else boolean false
 */
function fill_new_cat_content($definition_id, $user_id, $content = "", $user_ip = "")
{
    global $TBL_USERINFO_CONTENT;

    if (empty($user_ip)) {
        $user_ip = $_SERVER['REMOTE_ADDR'];
    }
    $definition_id = (int) $definition_id;
    $user_id = (int) $user_id;
    $content = Database::escape_string(trim($content));
    $user_ip = Database::escape_string(trim($user_ip));

    if (0 == $definition_id || 0 == $user_id || $content == "") {
        // Here we should introduce an error handling system...

        return false;
    }

    // Do not create if already exist
    $sql = "SELECT id FROM $TBL_USERINFO_CONTENT
            WHERE   definition_id   = '$definition_id'
            AND     user_id         = $user_id";

    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        return false;
    }

    $sql = "INSERT INTO $TBL_USERINFO_CONTENT SET
            content         = '$content',
            definition_id   = $definition_id,
            user_id         = $user_id,
            editor_ip       = '$user_ip',
            edition_time    = now()";

    Database::query($sql);

    return true;
}

/**
 * Edit a bloc for information category.
 *
 * @author - Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesche <gesche@ipm.ucl.ac.be>
 *
 * @param $definition_id
 * @param $user_id
 * @param $user_ip       DEFAULT $REMOTE_ADDR
 * @param $content       if empty call delete the bloc
 *
 * @return bool true if succeed, else boolean false
 */
function edit_cat_content($definition_id, $user_id, $content = "", $user_ip = "")
{
    global $TBL_USERINFO_CONTENT;
    $definition_id = (int) $definition_id;
    $user_id = (int) $user_id;
    $content = Database::escape_string(trim($content));
    if (empty($user_ip)) {
        $user_ip = $_SERVER['REMOTE_ADDR'];
    }
    $user_ip = Database::escape_string($user_ip);

    if (0 == $user_id || 0 == $definition_id) {
        return false;
    }

    if ($content == "") {
        return cleanout_cat_content($user_id, $definition_id);
    }

    $sql = "UPDATE $TBL_USERINFO_CONTENT SET
            content         = '$content',
            editor_ip       = '$user_ip',
            edition_time    = now()
            WHERE definition_id = $definition_id AND user_id = $user_id";

    Database::query($sql);

    return true;
}

/**
 * clean the content of a bloc for information category.
 *
 * @author Hugues peeters <peeters@ipm.ucl.ac.be>
 * @author Christophe Gesche <gesche@ipm.ucl.ac.be>
 *
 * @param $definition_id
 * @param $user_id
 *
 * @return bool true if succeed, else boolean false
 */
function cleanout_cat_content($user_id, $definition_id)
{
    global $TBL_USERINFO_CONTENT;
    $user_id = (int) $user_id;
    $definition_id = (int) $definition_id;

    if (0 == $user_id || 0 == $definition_id) {
        return false;
    }

    $sql = "DELETE FROM $TBL_USERINFO_CONTENT
            WHERE user_id = $user_id AND definition_id = $definition_id";

    Database::query($sql);

    return true;
}

/**
 * get the user info from the user id.
 *
 * @author - Hugues Peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesche <gesche@ipm.ucl.ac.be>
 *
 * @param int $user_id user id as stored in the Dokeos main db
 *
 * @return array containg user info sort by categories rank
 *               each rank contains 'title', 'comment', 'content', 'cat_id'
 */
function get_course_user_info($user_id)
{
    $TBL_USERINFO_DEF = Database:: get_course_table(TABLE_USER_INFO_DEF);
    $TBL_USERINFO_CONTENT = Database:: get_course_table(TABLE_USER_INFO_CONTENT);

    $user_id = (int) $user_id;
    $sql = "SELECT  cat.id catId,   cat.title,
                    cat.comment ,   content.content
            FROM    $TBL_USERINFO_DEF cat LEFT JOIN $TBL_USERINFO_CONTENT content
            ON cat.id = content.definition_id AND content.user_id = $user_id
            ORDER BY cat.rank, content.id";

    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        while ($userInfo = Database::fetch_array($result, 'ASSOC')) {
            $userInfos[] = $userInfo;
        }

        return $userInfos;
    }

    return false;
}

/**
 * get the user content of a categories plus the categories definition.
 *
 * @author - Hugues Peeters <peeters@ipm.ucl.ac.be>
 * @author - Christophe Gesche <gesche@ipm.ucl.ac.be>
 *
 * @param int $userId id of the user
 * @param int $catId  id of the categories
 *
 * @return array containing 'catId', 'title', 'comment', 'nbline', 'contentId' and 'content'
 */
function get_cat_content($userId, $catId)
{
    $TBL_USERINFO_DEF = Database:: get_course_table(TABLE_USER_INFO_DEF);
    $TBL_USERINFO_CONTENT = Database:: get_course_table(TABLE_USER_INFO_CONTENT);

    $userId = (int) $userId;
    $catId = (int) $catId;
    $sql = "SELECT  cat.id catId,   cat.title,
                    cat.comment ,   cat.line_count,
                    content.id contentId,   content.content
            FROM    $TBL_USERINFO_DEF cat LEFT JOIN $TBL_USERINFO_CONTENT content
            ON cat.id = content.definition_id
            AND content.user_id = $userId
            WHERE cat.id = $catId ";
    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        $catContent = Database::fetch_array($result, 'ASSOC');
        $catContent['nbline'] = $catContent['line_count'];

        return $catContent;
    }

    return false;
}

/**
 * get the definition of a category.
 *
 * @author Christophe Gesche <gesche@ipm.ucl.ac.be>
 * @author Hugues Peeters <peeters@ipm.ucl.ac.be>
 *
 * @param int $catId - id of the categories
 *
 * @return array containing 'id', 'title', 'comment', and 'nbline',
 */
function get_cat_def($catId)
{
    $TBL_USERINFO_DEF = Database:: get_course_table(TABLE_USER_INFO_DEF);

    $catId = (int) $catId;
    $sql = "SELECT id, title, comment, line_count, rank FROM $TBL_USERINFO_DEF WHERE id = $catId";

    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        $catDef = Database::fetch_array($result, 'ASSOC');
        $catDef['nbline'] = $catDef['line_count'];

        return $catDef;
    }

    return false;
}

/**
 * get list of all this course categories.
 *
 * @author Christophe Gesche <gesche@ipm.ucl.ac.be>
 * @author Hugues Peeters <peeters@ipm.ucl.ac.be>
 *
 * @return array containing a list of arrays.
 *               And each of these arrays contains
 *               'catId', 'title', 'comment', and 'nbline',
 */
function get_cat_def_list()
{
    $TBL_USERINFO_DEF = Database:: get_course_table(TABLE_USER_INFO_DEF);

    $sql = "SELECT  id catId,   title,  comment , line_count
            FROM  $TBL_USERINFO_DEF
            ORDER BY rank";

    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        while ($cat_def = Database::fetch_array($result, 'ASSOC')) {
            $cat_def_list[] = $cat_def;
        }

        return $cat_def_list;
    }

    return false;
}

/**
 * transform content in a html display.
 *
 * @author Hugues Peeters <peeters@ipm.ucl.ac.be>
 *
 * @param string $string string to htmlize
 *
 * @return string htmlized
 */
function htmlize($string)
{
    global $charset;

    return nl2br(htmlspecialchars($string, ENT_QUOTES, $charset));
}